This is a library of perfboard and single-sided PCB effect layouts for guitar and bass. I'm not an electrical engineer by any stretch of the imagination, just a DIY'er who likes drawing layouts. It is meant for the hobbyist (so commercial use of any of these layout is not allowed without permission) and as a way to give back to the online DIY community.

Thursday, February 12, 2015

Earthquaker Devices Speaker Cranker

Here's a simple one that should fit nicely in a 1590a. EQD's take on the Electra Distortion circuit. Instead of having a pot coming off the end of the circuit, the volume is controlled by a pot coming off the emitter of the 2N3904. It's really more of a gain control than volume and if you wanted to, you could add a master volume control coming off the output. Who doesn't love more knobs, right?


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19 comments:

  1. Giovane SoaveApril 6, 2015 at 1:19 AM

    Great layout, pedal and blog! :)

    ReplyDelete
  2. IvMJanuary 3, 2017 at 8:52 PM

    The best Electra's based boost!

    ReplyDelete
  3. IvMJanuary 4, 2017 at 12:15 AM

    It seems that the pot is b10k
    http://i.imgur.com/8O6zn56.jpg

    ReplyDelete
    Replies
    1. FacundoSeptember 4, 2019 at 8:04 AM

      Efectivamente, funciona mejor un b10k. Gracias!

      Delete
  4. BuxJune 1, 2017 at 2:32 PM

    Have you ever considered adding the schematics as well or do you just do the layouts based on tracing out the existing pedal circuit board? By the way, amazing site, I can't imagine the amount of time you have spent on this.

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    Replies
    1. Effects LayoutsJune 1, 2017 at 2:46 PM

      Thanks, man! Most of the schematics can be found either by googling for them or looking on Freestompboxes.org. Guys over there trace a lot of stuff.

      Delete
  5. sinaiDecember 17, 2017 at 9:42 AM

    hi.
    just bread boarded and i have replaced 0.47 cap for 68 and it sounds nice.
    really nice pedal.

    ReplyDelete
  6. RubenApril 21, 2018 at 1:46 PM

    Hey,
    just build the circuit and I get a drop of output volume. Only cranked at maximum it's about unity. Should I try other diodes (I used 1N34A) or change the operating point of the transistor? Any suggestions?

    Regards

    ReplyDelete
  7. Effects LayoutsApril 22, 2018 at 1:16 AM

    I've built a couple and they've all been plenty loud. Well above unity. You can try other diodes, but also make sure you're got the right resistor value going from voltage to the collector. Might not be biasing correctly.

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    Replies
    1. RubenApril 22, 2018 at 1:32 PM

      Yeah, changed the diodes to 1n4148 and now it's right above unity as well. Different sound, but still nice! Thanks for the reply.

      Delete
    2. AlessandroMarch 16, 2023 at 6:40 AM

      Hi, I have a question: I build it with a 1k pot and 1N34A diodes and the gain is quite higher than the demos I've heard. Could it be the wrong pot or the wrong biasing for the diodes?

      Delete
  8. JavierJune 25, 2018 at 1:43 AM

    Hi there, I really want to build this one... how I must wire a Master Volume Pot (V) to this circuit? PCB's Output to V1 & V3 (jumpered) and V2 to 3DPT (output)...? Thanks in advance!!

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  9. JavierJune 26, 2018 at 1:02 PM

    Sorry... V1 to ground, pcb output to V2 and V3 to 3DPT output, right? That makes sense? Thank youuu

    ReplyDelete
  10. AllanSimsJuly 6, 2018 at 3:17 AM

    V1 to Ground
    V2 to 3DPT switch
    PCB out to V3
    should work better

    ReplyDelete
    Replies
    1. Goliat FXJuly 9, 2018 at 2:42 PM

      Great! Thank you!!

      Delete
    2. ChuckAugust 31, 2018 at 1:35 PM

      What value would you use for the volume pot/trimmer?

      Delete
    3. Effects LayoutsAugust 31, 2018 at 2:35 PM

      A100k. Honestly though, having built several of these, it doesn't really need a volume pot. Rock it stock :D

      Delete
  11. octavezSeptember 29, 2019 at 11:11 PM

    Any idea why when I turn the pot I can hear some white noise/scratch? I tried with three different ones and same. Thanks for your help!

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  12. LUQUENWONovember 8, 2019 at 1:19 PM

    hi there,
    I have scratch noise when i move the potentiometer, any idea what it could be? the pot function its ok. maybe i bought a 100uf cap too low voltage, what you recommend me? thanks!

    ReplyDelete

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